ZIP code 08846, corresponding to Middlesex in New Jersey, spans an area of 3.44 square miles and had a population of 14,433 in 2022, resulting in a population density of 4,195.64 people per square mile. This population density places the area in the Urban classification, characterized by multi-story residential buildings, commercial structures, and high levels of infrastructure and services.

The historical population data for this ZIP code shows a consistent increase in population from 2010 to 2022, with a notable jump between 2020 and 2021. In 2010, the population was 13,549, with a population density of 3,938.66 people per square mile. Over the following decade, the population grew steadily, reaching 13,508 in 2020, with a population density of 3,926.74 people per square mile. The most significant increase occurred between 2020 and 2021, with the population rising to 14,432 and a population density of 4,195.35 people per square mile.

The consistent population growth and the area's urban classification suggest that the lifestyle in ZIP code 08846 is fast-paced, diverse, and culturally rich. Residents likely enjoy access to various amenities, such as extensive public transport, restaurants, theaters, and museums, which are typical of urban areas. The estimated number of housing units corresponding to the 2022 population is 5,529, indicating a mix of residential types and denser developments.